Skomer Marine Reserve offers a diverse underwater environment featuring both reefs and wrecks. Located 1609 metres from the shore, this site requires boat access and is suited for intermediate divers. The topography supports a range of depths from 10 to 45 metres, with an average depth of 15 metres. Divers should be prepared for strong currents and variable visibility ranging from 5 to 25 metres. Water temperatures fluctuate between 9C and 16C due to the convergence of Gulf Stream and Arctic currents. Given the potential for strong currents, surf, and deep sections, this site demands careful planning and experience in cold water environments.

Martins Haven is a shore-entry site located within the Skomer Marine Reserve. Divers access the water via a concrete slipway that leads into a rocky bay. The topography features a mix of reefs, walls, and drop-offs, with depths ranging from 6 to 30 metres and an average depth of 14 metres. Conditions include moderate currents and visibility between 10 and 30 metres. The site is suitable for intermediate divers and supports night diving. Hazards to consider include boat traffic, surf, and potential for low visibility. Facilities available at the location include parking, toilets, and guided tours.

West Hook is a shore-entry dive site located within the Skomer Marine Reserve. The site features a reef and kelp forest environment with an average depth of 9 metres. Divers can expect mild currents and visibility ranging from 5 to 15 metres. Typical dive times are approximately 45 minutes, and the site is suitable for beginners. Night diving is also permitted at this location. Water temperatures fluctuate between 9C and 17C throughout the year. Divers should remain aware of potential hazards, including boat traffic, entanglement risks, and surf conditions near the shore.

North Wall in the Skomer Marine Reserve is a boat-access site defined by a dramatic underwater cliff face. The topography consists of a wall, reef, and drop-off, with depths ranging from 10 to 45 metres and an average depth of 25 metres. Divers should be prepared for strong currents and variable visibility between 4 and 10 metres. The site is situated where warm Gulf Stream waters meet cold Arctic currents, resulting in temperatures between 9 and 16C. Due to the depth, strong currents, and potential for entanglement, this site is suitable for advanced divers. Boat traffic is a known hazard in this area.

Highpoint is a marine dive site located within the Skomer Marine Reserve in the United Kingdom. The site features a consistent depth of 9 metres. Water temperatures at this location vary throughout the year, ranging from a minimum of 9C in February and March to a maximum of 17C during August and September. As a marine environment, the site is subject to variable conditions typical of the region. It is suitable for divers looking for a shallow, consistent depth profile within the reserve. Access to this site is typically managed via boat from nearby coastal points.

High Point North is a shore-accessible reef and wall site located within the Skomer Marine Reserve. Divers typically explore depths between 15 and 18 metres, with an average depth of 15 metres. The site features a reef structure that drops away, requiring careful monitoring of the depth profile. Visibility generally ranges from 5 to 10 metres. Marine life observed at the site includes common wrasses, cod, spiny spider crabs, and European green crabs, alongside less frequent sightings of catsharks, compass jellyfish, and orange-clubbed nudibranchs. Due to boat traffic, divers must deploy a surface marker buoy before ascending. Shore entry and exit may involve a surf break.

St Brides Bay, located within the Skomer Marine Reserve, is a sheltered reef site characterised by red sandstone geology. The seabed features rocky reefs and kelp forests, providing a varied environment for both divers and snorkellers. Depths range from 10 to 30 metres, with an average depth of 12 metres. Conditions are generally mild, with visibility typically between 5 and 15 metres. Access is available via both shore and boat entries, making this a suitable location for beginners. Water temperatures fluctuate throughout the year, ranging from 9C in late winter to 17C in September.

Dale, located at the mouth of Milford Haven, offers diverse underwater terrain including reefs, walls, kelp forests, wrecks, and artificial reefs. This site is suitable for intermediate divers, with depths ranging from 15 to 90 metres. Access is strictly by boat. Conditions include moderate currents that can strengthen rapidly due to tidal flow, and visibility typically ranges between 5 and 15 metres. Water temperatures fluctuate from 9C in winter to 17C in September, making drysuits recommended year-round. Night diving is available. Divers should be aware of boat traffic, cold water, and potential down currents. Tidal planning for slack water is essential for safe navigation of this complex environment.